The veteran reward increases skill point gains, it doesn't effect your stats at all. The 20.93 is because 9 points in driver coils gives +99, and the skill works as a (skill/2)% increase - so 9 points is a 49.5% increase, not quite 50%.

Now borg engines with 9 points in driver coils is your best warp speed. Sector space speed and turn rate is independent of your ship, so a delta flyer or runabout won't help you, even though they have a much higher turn rate at impulse speed.

It might even hurt slightly, depending on exactly how edge detection works when you approach a sector border - larger ships might trigger transitions earlier if it's based on the edge and not center of the ship. But that's just speculation.